/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePurchaseInterface.h
IOnlinePurchase- Interface for IAP (In App Purchases) services
class IOnlinePurchase
FOnUnexpectedPu...
OnUnexpectedPurchaseReceiptDelegates
Delegate fired when the local system tells us of a new completed purchase we may not have initiated in-game.